Hello Jay-R,
Very good question here, but it is from those questions that have no precise answers.
However, I will explain to you what is the logic.
If you use the common acceptance criteria in the generator, all the strategies will be filtered there(this is what I do).
If you want to use the optimizer, it is recommendable to use the common acceptance criteria again. Because the strategies that will come from the generator fitting the acceptance criteria but the optimizer can change that. Normally it should change them in a better way and improve Profit Factor, Consecutive losses and so on, but might lower the number of trades.
Anyway using the Monte Carlo is a must after the generator.
Have a look at the Normalizer, it is quite interesting. I will upload an update video about it.
Cheers,